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Nanowires: Metal‐Dielectric‐CNT Nanowires for Femtomolar Chemical Detection by Surface Enhanced Raman Spectroscopy (Adv. Mater. 32/2013)
Author(s) -
Altun Ali Ozhan,
Youn Seul Ki,
Yazdani Nuri,
Bond Tiziana,
Park Hyung Gyu
Publication year - 2013
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201370199
Subject(s) - materials science , nanowire , hafnia , raman spectroscopy , carbon nanotube , raman scattering , plasmon , nanotechnology , dielectric , quenching (fluorescence) , surface modification , surface enhanced raman spectroscopy , optoelectronics , chemical engineering , optics , composite material , cubic zirconia , ceramic , physics , fluorescence , engineering
Irradiation of a dark red laser (λ = 785 nm) on a canopy gold‐hafnia‐carbon nanotubes (CNTs), supported by vertically aligned hafnia‐CNTs without gold, can induce local plasmonic enhancement of the electromagnetic field at the CNT junctions by a “kissing nanowire” effect. This is demonstrated by work by Hyung Gyu Park, Tiziana Bond and co‐workers on page 4431 . Eliminating the quenching of surface plasmons through the CNT by the insertion of a dielectric barrier (hafnia), molecules such as 1,2bis‐(4‐pyridyl)‐ethylene located in these hot spots can be detected at femtomolar‐level concentrations by surface enhanced Raman scattering